Release 3.4.0

[kelson42]

• [x] Check if library dependence version check has been updated properly in Meson
• [x] Merge/apply latest translations from Translatewiki
• [x] CI is green on git master
• [x] Kiwix-Build is OK
• [x] Update the Changelog
• [x] Update version
• [x] Create a tag on git
• [x] Secure new source/sbinaries are published on https://download.kiwix.org/release/kiwix-tools
• [ ] Test Windows binaries work fine
• [ ] Test Linux binaries work fine
• [x] Update the Github release with the Changelog
• [ ] Create new empty entry in Changelog (placeholder for future entries)
• [x] Close current milestone and create new one incrementaly (a priori a minor version)
• [ ] Publicize these new versions